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stich3 [128]
3 years ago
15

The surface of Josh's desk measures 2.6 feet by 2.8 feet. What is the area of the desk?

Mathematics
1 answer:
attashe74 [19]3 years ago
5 0
To get the area, multiply the length x width
2.6 x 2.8 = 7.28
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HELp meh with this question it very hard
Dovator [93]

Answer:

  • AB = 7 cm

Step-by-step explanation:

<u>Use the law of cosines to find the side AB:</u>

  • AB = \sqrt{(x + 3)^2+x^2-2x(x+3)cos (60)} =
  • \sqrt{x^2+6x+9+x^2-x^2-3x}  = \sqrt{x^2+3x+9}

<u>Use the Heron's area formula next:</u>

  • A = \sqrt{s(s - a)(s-b)(s-c)}, where s- semi perimeter
  • s = 1/2[x + x + 3 + \sqrt{x^2+3x+9}) = 1/2 (2x + 3 + \sqrt{x^2+3x+9})
  • s - a = 1/2 (2x + 3 + \sqrt{x^2+3x+9} - 2x - 6) = 1/2 (\sqrt{x^2+3x+9 } - 3)
  • s - b = 1/2 (2x + 3 + \sqrt{x^2+3x+9} - 2x) = 1/2 (\sqrt{x^2+3x+9} + 3)
  • s - c = 1/2 (2x + 3 + \sqrt{x^2+3x+9} - 2\sqrt{x^2+3x+9}) = 1/2 (2x + 3 - \sqrt{x^2+3x+9})

<u>Now</u>

  • (s - a)(s - b) = 1/4 [(x²+3x+9) - 9] = 1/4 (x² + 3x)
  • s(s - c) = 1/4 [(2x + 3)² - (x² + 3x + 9)] = 1/4 (3x²+ 9x) = 3/4(x² + 3x)

<u>Next</u>

  • A² = 3/16(x² + 3x)(x² + 3x)
  • 300 = 3/16(x² + 3x)²
  • 1600 = (x² + 3x)²
  • x² + 3x = 40

<u>Substitute this into the first equation:</u>

  • AB = \sqrt{40 + 9} = 7 cm

4 0
3 years ago
Can someone please help me?!
Lyrx [107]
Graphically, you have to go UP 1 slot (the y axis). You go up because the 1 in 1/5 is positive. If it were negative, it would go DOWN 1 slot. Then, you go to the RIGHT 5 slots because the 5 is positive. If it were negative, you would go to the left. Hope that helps!
5 0
3 years ago
What is the difference when the product of 0.3 and 0.4 is subtracted from the sum of 0.3 and 0.4?​
Rudik [331]

Answer:

0.58

Step-by-step explanation:

The first approach to solving the question above is to find the product of 0.3 and 0.4 thus:

0.3 \times 0.4 = 0.12

Next step is to find the sum of 0.3 and 0.4 thus:

0.3 + 0.4 = 0.7

The final step is to find the difference between the two results. Thus:

0.7 - 0.12 = 0.58

Therefore, the product of 0.3 and 0.4 subtracted from the sum of 0.3 and 0.4 is 0.58

7 0
3 years ago
What is y=-x+6?........
SIZIF [17.4K]

Answer:

Slope = -2/2 = -1

x-intercept = 6/1 = 6

y-intercept = 6/1 = 6

I wasn't sure what you really were asking for, so I did slope, x, and y.

8 0
3 years ago
What is 12 2/3 X 2 1/2
vampirchik [111]

Answer:

31.67

Step-by-step explanation:

12 2/3 X 2 1/2

we begin by converting this into improper fractions,

= 38/3 * 5/2

= 95/3

= 31.67

8 0
3 years ago
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